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voc2coco.py
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voc2coco.py
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#!/usr/bin/python
#
# Copyright (c) 2020 JinTian.
#
# This file is part of alfred
# (see http://jinfagang.github.io).
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
# pip install lxml
import sys
import os
import json
import xml.etree.ElementTree as ET
from alfred.utils.log import logger as logging
START_BOUNDING_BOX_ID = 1
PRE_DEFINE_CATEGORIES = {}
# If necessary, pre-define category and its id
#PRE_DEFINE_CATEGORIES = {"aeroplane": 1, "bicycle": 2, "bird": 3, "boat": 4,
#"bottle":5, "bus": 6, "car": 7, "cat": 8, "chair": 9,
#"cow": 10, "diningtable": 11, "dog": 12, "horse": 13,
#"motorbike": 14, "person": 15, "pottedplant": 16,
#"sheep": 17, "sofa": 18, "train": 19, "tvmonitor": 20}
## add pre-define category
PRE_DEFINE_CATEGORIES = {'person': 0, 'bicycle': 1, 'car': 2, 'motorcycle': 3, 'airplane': 4, 'bus': 5,
'train': 6, 'truck': 7, 'boat': 8, 'traffic light': 9, 'fire hydrant': 10,
'stop sign': 11, 'parking meter': 12, 'bench': 13, 'bird': 14, 'cat': 15, 'dog': 16,
'horse': 17, 'sheep': 18, 'cow': 19, 'elephant': 20, 'bear': 21, 'zebra': 22, 'giraffe': 23,
'backpack': 24, 'umbrella': 25, 'handbag': 26, 'tie': 27, 'suitcase': 28, 'frisbee': 29,
'skis': 30, 'snowboard': 31, 'sports ball': 32, 'kite': 33, 'baseball bat': 34,
'baseball glove': 35, 'skateboard': 36, 'surfboard': 37, 'tennis racket': 38,
'bottle': 39, 'wine glass': 40, 'cup': 41, 'fork': 42, 'knife': 43, 'spoon': 44, 'bowl': 45,
'banana': 46, 'apple': 47, 'sandwich': 48, 'orange': 49, 'broccoli': 50, 'carrot': 51,
'hot dog': 52, 'pizza': 53, 'donut': 54, 'cake': 55, 'chair': 56, 'couch': 57,
'potted plant': 58, 'bed': 59, 'dining table': 60, 'toilet': 61, 'tv': 62, 'laptop': 63,
'mouse': 64, 'remote': 65, 'keyboard': 66, 'cell phone': 67, 'microwave': 68,
'oven': 69, 'toaster': 70, 'sink': 71, 'refrigerator': 72, 'book': 73, 'clock': 74,
'vase': 75, 'scissors': 76, 'teddy bear': 77, 'hair drier': 78, 'toothbrush': 79
}
def get(root, name):
vars = root.findall(name)
return vars
def get_and_check(root, name, length):
vars = root.findall(name)
if len(vars) == 0:
raise NotImplementedError('Can not find %s in %s.' % (name, root.tag))
if length > 0 and len(vars) != length:
raise NotImplementedError(
'The size of %s is supposed to be %d, but is %d.' % (name, length, len(vars)))
if length == 1:
vars = vars[0]
return vars
def get_filename_as_int(filename):
try:
filename = os.path.splitext(filename)[0]
return int(filename)
except:
raise NotImplementedError(
'Filename %s is supposed to be an integer.' % (filename))
"""
xml_list is optional, we at least need xml_dir and json_file
"""
def convert(xml_dir, json_file=None, xml_list=None, index_1=False):
if index_1:
print('Annotations save with index start from 1.')
if xml_list:
list_fp = open(xml_list, 'r')
else:
list_fp = os.listdir(xml_dir)
logging.info('we got all xml files: {}'.format(len(list_fp)))
json_dict = {"images": [], "type": "instances", "annotations": [],
"categories": []}
categories = PRE_DEFINE_CATEGORIES
bnd_id = START_BOUNDING_BOX_ID
i = 0
for line in list_fp:
line = line.strip()
if i % 1000 == 0:
print("Processing %s" % (line))
xml_f = os.path.join(xml_dir, line)
tree = ET.parse(xml_f)
root = tree.getroot()
path = get(root, 'path')
if len(path) == 1:
filename = os.path.basename(path[0].text)
elif len(path) == 0:
filename = get_and_check(root, 'filename', 1).text
else:
raise NotImplementedError(
'%d paths found in %s' % (len(path), line))
# compare filename with xml filename
if os.path.basename(xml_f).split('.')[0] != filename.split('.')[0]:
# if not equal, we replace filename with xml file name
# print('{} != {}'.format(os.path.basename(xml_f).split('.')[0], filename.split('.')[0]))
filename = os.path.basename(xml_f).split(
'.')[0] + '.' + filename.split('.')[-1]
# filename could be wrong sufix
print('revise filename to: {}'.format(filename))
if not os.path.exists(os.path.join(os.path.dirname(xml_f), filename)):
logging.info(
'revise filename wrong, try change sufix (but also could be wrong, check your VOC format pls.)')
filename = filename.split('.')[0] + '.jpg'
# The filename must be a number
# image_id = get_filename_as_int(filename)
image_id = i
size = get_and_check(root, 'size', 1)
width = int(get_and_check(size, 'width', 1).text)
height = int(get_and_check(size, 'height', 1).text)
image = {'file_name': filename, 'height': height, 'width': width,
'id': image_id}
json_dict['images'].append(image)
# Cruuently we do not support segmentation
# segmented = get_and_check(root, 'segmented', 1).text
# assert segmented == '0'
for obj in get(root, 'object'):
category = get_and_check(obj, 'name', 1).text
if category not in categories:
new_id = len(categories)+1 if index_1 else len(categories)
categories[category] = new_id
category_id = categories[category]
bndbox = get_and_check(obj, 'bndbox', 1)
xmin = float(get_and_check(bndbox, 'xmin', 1).text)
ymin = float(get_and_check(bndbox, 'ymin', 1).text)
xmax = float(get_and_check(bndbox, 'xmax', 1).text)
ymax = float(get_and_check(bndbox, 'ymax', 1).text)
assert(xmax > xmin)
assert(ymax > ymin)
o_width = abs(xmax - xmin)
o_height = abs(ymax - ymin)
ann = {'area': o_width*o_height, 'iscrowd': 0, 'image_id':
image_id, 'bbox': [xmin, ymin, o_width, o_height],
'category_id': category_id, 'id': bnd_id, 'ignore': 0,
'segmentation': []}
json_dict['annotations'].append(ann)
bnd_id = bnd_id + 1
# image_id plus 1
i += 1
for cate, cid in categories.items():
cat = {'supercategory': 'none', 'id': cid, 'name': cate}
json_dict['categories'].append(cat)
if not json_file:
json_file = 'annotations_coco.json'
logging.info(
'converted coco format will saved into: {}'.format(json_file))
json_fp = open(json_file, 'w')
json_str = json.dumps(json_dict)
json_fp.write(json_str)
json_fp.close()
logging.info('done.')
if __name__ == '__main__':
if len(sys.argv) < 3:
print('at least 2 auguments are need.')
print('Usage: %s XML_LIST.txt(optional) XML_DIR OUTPU_JSON.json' %
(sys.argv[0]))
exit(1)
if len(sys.argv) == 3:
# xml_dir, output_json
convert(sys.argv[1], sys.argv[2])
elif len(sys.argv) == 4:
# xml_list, xml_dir, output_json
convert(sys.argv[1], sys.argv[2], sys.argv[3])